Alnus serrulata, commonly known as Smooth Alder, is a native deciduous shrub or small tree found throughout eastern North America, particularly along streams, wetlands, and moist woodlands. Typically growing 10 to 25 feet tall with a multi-stemmed, spreading habit, Smooth Alder is valued for its adaptability to wet soils and its role in naturalized and restoration plantings. It features glossy green, finely serrated leaves and produces small catkins in late winter to early spring, providing early seasonal interest. Smooth Alder is especially useful for stabilizing soil and improving site conditions in challenging, moisture-rich environments.

Why choose Smooth Alder

• Native species: Naturally occurs throughout eastern North America

• Wet-soil tolerant: Thrives in moist to wet sites where many plants struggle

• Restoration value: Commonly used for streambanks and erosion control

Cultivating tips

• Sun exposure: Full sun to part shade

• Soil needs: Prefers consistently moist to wet soils; tolerates periodic flooding

• Maintenance: Low—prune as needed in late winter to manage size or shape

Designs for your garden

• Naturalized plantings: Ideal for woodland edges, wetlands, and riparian zones

• Rain gardens: Performs well in moisture-retentive areas

• Screening: Multi-stemmed habit provides natural coverage and structure

Ecological benefits

• Native value: Supports regional ecosystems and native wildlife

• Soil improvement: Nitrogen-fixing roots help enrich surrounding soils

• Wildlife support: Provides cover and early-season resources for insects and birds